Amazon Fresh is joining its competitors, Target and Walmart, in cutting prices on grocery staples to attract customers looking for deals. The primarily online grocery delivery service, which also operates a few brick-and-mortar locations, said its U.S. shoppers will be able to get discounts up to 30% on 4,000 grocery items in-store and online. The slashed prices on groceries will rotate on a weekly basis. Some of the products that will be part of the price reductions include meat, seafood, beverages, snacks, pasta, frozen food, dairy and cheese products. The items eligible for reduction will b…